<template>
  <div class="xtx-cart-page">
    <div class="container">
      <XtxBread>
        <XtxBreadItem to="/">首页</XtxBreadItem>
        <XtxBreadItem>购物车</XtxBreadItem>
      </XtxBread>
      <div class="cart">
        <table>
          <thead>
            <tr>
              <th width="120">
                <XtxCheckbox :modelValue="$store.getters['cart/isAll']"
                  @change="allChange">全选</XtxCheckbox>
              </th>
              <th width="400">商品信息</th>
              <th width="220">单价</th>
              <th width="180">数量</th>
              <th width="180">小计</th>
              <th width="140">操作</th>
            </tr>
          </thead>
          <!-- 有效商品 -->
          <tbody>
            <tr v-for="i in $store.getters['cart/effectiveList']" :key="i">
            <!-- 单选框 -->
            <!-- 直接v-mode="vuex中的数据"也有效果，能实现双向数据绑定，但是不推荐，在严格模式下会报错，必须走mutation函数进行修改vuex中的数据 -->
            <!-- 难点：拿到选择框最新的数据状态，把它修改到vuex中对应的数据项
                 由于在父组件需要拿到子组件XtxCheckbox中的选择状态，子传父技术
            -->
              <td><XtxCheckbox :model-value="i.selected" @change="(selected) => checkChange(i, selected)" /></td>
              <td>
                <div class="goods">
                  <RouterLink to="/"><img :src="i.picture" alt=""></RouterLink>
                  <div>
                    <p class="name ellipsis">{{ i.name }}</p>
                    <!-- 选择规格组件 -->
                  </div>
                </div>
              </td>
              <td class="tc">
                <p>&yen;{{ i.nowPrice }}</p>
                <p>比加入时降价 <span class="red">&yen;{{ i.price - i.nowPrice }}</span></p>
              </td>
              <td class="tc">
                <XtxNumbox :model-value="i.count"
                @change="(num) => numChange(i, num)"
                :isLabel="false"/>
              </td>
              <td class="tc"><p class="f16 red">&yen;{{ ( i.nowPrice * i.count ).toFixed(2)}}</p></td>
              <td class="tc">
                <p><a @click="delCart(i)" class="green" href="javascript:;">删除</a></p>
              </td>
            </tr>
          </tbody>
        </table>
      </div>
      <!-- 操作栏 -->
      <div class="action">
        <div class="batch">
          <XtxCheckbox>全选</XtxCheckbox>
          <a href="javascript:;">删除商品</a>
          <a href="javascript:;">清空失效商品</a>
        </div>
        <div class="total">
          共 {{ $store.getters['cart/effectiveList'].length }} 件商品，已选择 {{ $store.getters['cart/selectedList'].length }} 件，商品合计：
          <span class="red">¥{{ $store.getters['cart/allSelectedPrice'].toFixed(2) }}</span>
          <XtxButton @click="goSettled" type="primary">下单结算</XtxButton>
        </div>
      </div>

    </div>
  </div>
</template>
<script>
import { useStore } from 'vuex'
import { useRouter } from 'vue-router'
import { message } from '@/components/Message/index.js'
export default {
  name: 'XtxCartPage',
  setup () {
    const store = useStore()
    const router = useRouter()
    // 点击删除按钮 删除购物车中的商品
    function delCart (goods) {
      // 触发action函数
      store.dispatch('cart/asyncDelCart', goods).then(() => {
        message({ type: 'success', text: '删除成功' })
      })
    }

    // 接收子组件中的最新切换状态 小选框
    function checkChange (goods, selected) {
      console.log('checked goods', selected, goods)
      // 使用这个状态修改vuex中 对应的那一项中的selected字段
      store.dispatch('cart/asyncSingleCheck', { goods, selected })
    }

    // 全选框状态 同步到vuex中的数据
    function allChange (checked) {
      console.log('全选框', checked)
      store.dispatch('cart/asyncAllCheck', checked)
    }

    // 修改数量 同步到vuex
    function numChange (goods, num) {
      console.log('goods, num', goods, num)
      store.dispatch('cart/asyncChangeNum', { goods, num })
    }

    // 下单结算
    function goSettled () {
      // 1. 不能为非登陆状态
      if (!store.state.user.profile.token) {
        message({ type: 'warn', text: '请先登录' })
        return false
      }
      // 2. 判断 选择的商品数量不能为0 vuex getters
      if (store.getters['cart/selectedList'].length === 0) {
        message({ type: 'warn', text: '已选商品数不能为0' })
        return false
      }
      // 跳转到订单结算页
      router.push('/settlement')
    }
    return { delCart, checkChange, allChange, numChange, goSettled }
  }
}
</script>
<style scoped lang="less">
.tc {
  text-align: center;
  .xtx-numbox {
    margin: 0 auto;
    width: 120px;
  }
}
.red {
  color: @priceColor;
}
.green {
  color: @xtxColor
}
.f16 {
  font-size: 16px;
}
.goods {
  display: flex;
  align-items: center;
  img {
    width: 100px;
    height: 100px;
  }
  > div {
    width: 280px;
    font-size: 16px;
    padding-left: 10px;
    .attr {
      font-size: 14px;
      color: #999;
    }
  }
}
.action {
  display: flex;
  background: #fff;
  margin-top: 20px;
  height: 80px;
  align-items: center;
  font-size: 16px;
  justify-content: space-between;
  padding: 0 30px;
  .xtx-checkbox {
    color: #999;
  }
  .batch {
    a {
      margin-left: 20px;
    }
  }
  .red {
    font-size: 18px;
    margin-right: 20px;
    font-weight: bold;
  }
}
.tit {
  color: #666;
  font-size: 16px;
  font-weight: normal;
  line-height: 50px;
}
.xtx-cart-page {
  .cart {
    background: #fff;
    color: #666;
    table {
      border-spacing: 0;
      border-collapse: collapse;
      line-height: 24px;
      th,td{
        padding: 10px;
        border-bottom: 1px solid #f5f5f5;
        &:first-child {
          text-align: left;
          padding-left: 30px;
          color: #999;
        }
      }
      th {
        font-size: 16px;
        font-weight: normal;
        line-height: 50px;
      }
    }
  }
}
</style>
